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package it.unitn.science.matr155863_148346_145963.bccstore.filter;

import it.unitn.science.matr155863_148346_145963.bccstore.items.User;
import java.io.IOException;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import org.apache.log4j.Logger;

/**
 *
 * @author berto
 */
public class SellerFLT implements Filter {
    
    private static final boolean debug = true;
    // The filter configuration object we are associated with.  If
    // this value is null, this filter instance is not currently
    // configured. 
    private FilterConfig filterConfig = null;
    private static Logger log = Logger.getLogger(SellerFLT.class);
    
    public SellerFLT() {
    }    
    
    private void doBeforeProcessing(ServletRequest request, ServletResponse response)
            throws IOException, ServletException {
        if (debug) {
            log("Seller:DoBeforeProcessing");
        }
    }    
    
    private void doAfterProcessing(ServletRequest request, ServletResponse response)
            throws IOException, ServletException {
        if (debug) {
            log("Seller:DoAfterProcessing");
        }
    }

    /**
     *
     * @param request The servlet request we are processing
     * @param response The servlet response we are creating
     * @param chain The filter chain we are processing
     *
     * @exception IOException if an input/output error occurs
     * @exception ServletException if a servlet error occurs
     */
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain)
            throws IOException, ServletException {
        
        if (debug) {
            log("Seller:doFilter()");
        }
        
        doBeforeProcessing(request, response);
        
        Throwable problem = null;
        try {
            String address="/contents/public/errorPage.html";
            User user = (User) ((HttpServletRequest)request).getSession().getAttribute("user");
            if((user!=null)&&(user.getSeller())){
                address=((HttpServletRequest) request).getRequestURI();
                address=address.substring(1);//Rimuovo il primo /
                address=address.substring(address.indexOf("/"));
            }else{
                log.warn("User not logged o without permission on seller try to load: "+request.getLocalAddr());
                request.setAttribute("error_message", "Before you can see this page you must authenticate like a seller");
            }
            RequestDispatcher dispatcher=filterConfig.getServletContext().getRequestDispatcher(address);
            dispatcher.include(request, response);
        } catch (Throwable t) {
            log.error(t);
            RequestDispatcher dispatcher=request.getRequestDispatcher("/contents/public/errorPage.html");
            dispatcher.include(request, response);
        }
        
        doAfterProcessing(request, response);

    }

    /**
     * Return the filter configuration object for this filter.
     */
    public FilterConfig getFilterConfig() {
        return (this.filterConfig);
    }

    /**
     * Set the filter configuration object for this filter.
     *
     * @param filterConfig The filter configuration object
     */
    public void setFilterConfig(FilterConfig filterConfig) {
        this.filterConfig = filterConfig;
    }

    /**
     * Destroy method for this filter 
     */
    public void destroy() {        
    }

    /**
     * Init method for this filter 
     */
    public void init(FilterConfig filterConfig) {        
        this.filterConfig = filterConfig;
        if (filterConfig != null) {
            if (debug) {                
                log("Seller:Initializing filter");
            }
        }
    }

    /**
     * Return a String representation of this object.
     */
    @Override
    public String toString() {
        if (filterConfig == null) {
            return ("Seller()");
        }
        StringBuffer sb = new StringBuffer("Seller(");
        sb.append(filterConfig);
        sb.append(")");
        return (sb.toString());
    }
    
    private void sendProcessingError(Throwable t, ServletResponse response) {
        String stackTrace = getStackTrace(t);        
        
        if (stackTrace != null && !stackTrace.equals("")) {
            try {
                response.setContentType("text/html");
                PrintStream ps = new PrintStream(response.getOutputStream());
                PrintWriter pw = new PrintWriter(ps);                
                pw.print("<html>\n<head>\n<title>Error</title>\n</head>\n<body>\n"); //NOI18N

                // PENDING! Localize this for next official release
                pw.print("<h1>The resource did not process correctly</h1>\n<pre>\n");                
                pw.print(stackTrace);                
                pw.print("</pre></body>\n</html>"); //NOI18N
                pw.close();
                ps.close();
                response.getOutputStream().close();
            } catch (Exception ex) {
            }
        } else {
            try {
                PrintStream ps = new PrintStream(response.getOutputStream());
                t.printStackTrace(ps);
                ps.close();
                response.getOutputStream().close();
            } catch (Exception ex) {
            }
        }
    }
    
    public static String getStackTrace(Throwable t) {
        String stackTrace = null;
        try {
            StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
            t.printStackTrace(pw);
            pw.close();
            sw.close();
            stackTrace = sw.getBuffer().toString();
        } catch (Exception ex) {
        }
        return stackTrace;
    }
    
    public void log(String msg) {
        filterConfig.getServletContext().log(msg);        
    }
}
